Forum .LRN Q&A: Problems while trying to admin a class

I got this error while I was trying to admin a class in my dotLRN instance.  Help will be greatly apreciated.

We had a problem processing your entry:

      get_element_param: Invalid element_id () and/or key (folder_id) given.

Please back up using your browser, correct it, and resubmit your entry.

I hope someone can advice on what to do on this case, because backing up an resubmiting doesnt work.

Windell.